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What Causes Different Types of Mould
Knowing what areas of your home could be at risk for developing mould is essential. Not only can mould cause severe property damage, but it also puts your family’s health at risk. Knowing what causes different types of mould can help you prevent future growth and mitigate any existing damage. Here’s a breakdown of what typically causes every kind of mould:
Black Mould
Black mould thrives in areas with prolonged moisture exposure, especially where water damage has occurred. It grows on cellulose-rich materials like drywall, wood, or insulation. High humidity, roof leaks, or flooding can create the ideal environment for black mould to flourish.
Green Mould
Aspergillus is often caused by poor ventilation and dampness in areas such as walls, fabrics, or food storage. It can also grow in HVAC systems, improperly stored grains, or compost piles, particularly in warm, humid climates.
Black or Green Mould – Cladosporium
This mould is triggered by high humidity and can grow in both cool and warm conditions. It’s commonly found on wood, carpets, or fabrics exposed to dampness for an extended period of time. Leaky windows, condensation, or damp basements often promote its growth.
White Mould
Acremonium grows in areas with consistent moisture or condensation, such as humidifiers, cooling coils, window seals, and drywall. Water-damaged materials or prolonged exposure to condensation are primary triggers.
Yellow Mould
This type of mould, also known as dry rot, is caused by persistent moisture in wood or organic materials. It’s common in poorly ventilated crawl spaces, damp basements, or waterlogged wood. Plumbing leaks or seepage through foundations can contribute to its growth.
Other Contributing Factors Across All Mould Types:
High Humidity Levels – Most moulds can thrive when indoor humidity exceeds 60%.
Organic Materials – Moulds commonly grow on wood, fabric, paper, or food due to their organic nutrients.
Poor Ventilation – Stagnant air creates ideal conditions for mould spores to settle and grow.
Water Leaks – Leaky pipes, roofs, or foundations provide the moisture needed for mould.
Flooding – Standing water or improperly dried spaces after flooding can lead to significant mould growth.